Reborn as flatline and I have the powers of Rogue Sun in DC

[If you're a fan of this fanfiction, make sure to check out the exciting announcement in the notes at the end of the chapter!]

In a luxurious hotel in the heart of Tokyo, a man clad in military-style gear walked casually down a carpeted hallway. His heavy boots thudded against the floor, the sound muffled by the plush carpeting, but his presence was far from subtle.

To anyone watching, his attire—tactical vest, holstered weapons, and all—should have raised alarms. But here, in this high-security VIP wing, it was normal.

He stopped in front of a suite door marked with an engraved gold plate, swiped a keycard, and stepped inside.

The room was lavish—polished marble floors, leather furniture, and the faint scent of expensive cigars lingering in the air. At the center of it all was a fat, sharply dressed Japanese man lounging on a velvet chair, a glass of whiskey in one hand and a smirk on his face.

The soldier gave a crisp nod. "Sir, the weapons are being shipped as we speak. They should reach the buyers soon."

The fat man's grin widened, his face glistening with sweat under the chandelier's light. "Good. With those weapons out, the gangs will turn on Lord Death Man. A gang war will erupt, and no matter who wins, both sides will be weakened. That's when we'll strike."

His grin turned almost predatory. "Finally, Japan will be mine… and I'll rule over it all. The leader of—"

He didn't finish the sentence.

The lights went out.

The room plunged into darkness, and the fat man's grin vanished in an instant. "The hell's going on?" he barked, his voice cracking slightly.

The soldier beside him remained calm, stepping closer. "Don't worry, sir. I'm here to protect you." He reached for his radio, pressing the button to speak.

"This is Sector Three. What's going on out there?"

A garbled response came through, drowned by the sound of rapid gunfire.

Bang. Bang. Bang.

The fat man flinched, gripping the armrests of his chair.

"S-SIR—!" a panicked voice crackled through the radio. "He sent him after us! He sent—"

The voice cut off, replaced by static.

The fat man's face drained of color. "Who? Who's out there?"

The soldier tightened his grip on his weapon, his stance firm. "Sir, I suggest you get to the safe room. Now."

The fat man didn't need to be told twice. He scrambled to his feet, waddling toward the wall behind him. With a press of a hidden panel, the wall slid open, revealing a secure chamber. He disappeared inside without a word, the door hissing shut behind him.

Silence filled the room, broken only by the faint hum of the building's emergency lighting kicking in. The soldier stood his ground, his gaze fixed on the suite's entrance.

Tap. Tap. Tap.

Footsteps echoed faintly from the hallway.

Someone was coming.

The soldier raised his weapon, muscles coiled and ready. The door creaked open, and a figure stepped into the room.

Dressed in casual clothing, the person didn't immediately seem threatening. But the longer the soldier looked, the more unsettling the figure became.

The man—or at least, that's what it looked like—wore two strange arm guards that gleamed faintly under the dim light. A katana was strapped across his back, its hilt wrapped in dark cloth.

But the most striking feature was the mask.

A pure black mask shaped like a demonic face with three sharp horns protruding from the top.

The soldier's hands tightened on his weapon. "So," he muttered, his voice low. "Lord Death Man sent you. Mongrel."

The figure tilted their head slightly, the mask gleaming ominously.

So, you're Jarvis, a foreigner who came to Japan, hoping to make it big with your recently awakened metahuman powers. Mongrel said.

Jarvis flinched, his body tensing. He knows about me.

Mongrel tilted his head slightly. "Oh well, I'm completing this Mission way too fast already. Might as well kill some time playing around with you."

Hearing this, Jarvis's anger surged. He raised his pistol, pointing it directly at Mongrel. The barrel glowed faintly before the weapon roared to life, sending a bullet screaming through the air.

But Mongrel dodged it with ease.

Jarvis froze, his confidence wavering. How…?

His power was enhancement. He didn't just make the bullet stronger—it was faster, sharper, deadlier. There was no way an ordinary person could avoid it.

But Mongrel wasn't ordinary.

The realization hit hard. Jarvis's hands trembled slightly, but he bit his tongue, forcing himself to focus. He couldn't afford to panic.

Mongrel didn't wait.

In an instant, he closed the distance, driving his fist into Jarvis's gut. The blow sent shockwaves through his body, and he doubled over, nearly retching.

Desperation kicked in. Jarvis gripped his knife, the blade glowing as he enhanced it with his power. He swung wildly, slashing at Mongrel in quick, furious arcs.

But Mongrel dodged each strike effortlessly, weaving through the attacks with precision.

Jarvis barely had time to react before Mongrel struck back, landing quick, calculated hits that left him stumbling.

The fight escalated. Jarvis lunged again, but Mongrel spun into a roundhouse kick, the force slamming into Jarvis's side and sending him staggering. Before Jarvis could recover, Mongrel stepped onto his face and used the leverage to propel himself into a graceful backflip.

Jarvis gritted his teeth. Now's my chance.

As Mongrel hung in mid-air, Jarvis threw his knife with all his strength. There's no way he can dodge this.

But Mongrel twisted, shifting mid-air with a sudden burst of momentum. The knife missed by inches, embedding itself into the wall.

Did he just… double jump?

Jarvis's eyes widened as he noticed the faint glow emanating from Mongrel's boots.

Before he could process it, a gunshot rang out. His pistol shattered in his hand.

Jarvis staggered, staring at the broken weapon. His eyes darted to Mongrel, who had landed gracefully, his strange arm guards revealing a hidden barrel.

"A gun bracelet?" Jarvis muttered. Just like Deadshot's.

Mongrel lowered the weapon slightly, his voice calm but firm. "Alright, I think I've had enough fun. It's time to take you out."

He pointed the gun at Jarvis, his aim steady.

Time seemed to slow for Jarvis. His heartbeat thundered in his chest. The world around him blurred as panic consumed him. No, no, no! It shouldn't be like this.

The bullet drew closer, inches away from his chest.

I'm going to die.

He almost gave in to the thought. I should've stayed in my small town.

But something inside him refused to give up.

No! I don't want to die! No, no, no!

A surge of energy exploded from within him, his body glowing brightly. The bullet dropped harmlessly to the ground.

Jarvis stood there, staring at himself in shock. His hands trembled as he realized what had happened. His ability had awakened further, pushing him to survive.

"Hah… interesting," Mongrel said, his voice laced with amusement. "The stress of almost dying must've triggered another evolution in your power. Doesn't matter, though."

Jarvis's body shook with adrenaline. He smiled, slowly regaining his composure. "No, this… this changes everything. Now I'll—"

Before he could finish, Mongrel launched himself forward, using his glowing boots to propel into the air. He twisted his body mid-flight, slamming both feet into Jarvis's chest. The force sent him flying backward, crashing into the wall.

Jarvis gasped for air, his mind racing.

Mongrel landed smoothly, adjusting his stance. This isn't an anime Gaining a new ability doesn't mean anything if you don't know how to use it."

He charged again, slamming his shoulder into Jarvis and sending him hurtling across the room. The impact shattered a window, and Jarvis tumbled through, plummeting to the street below.

The sound of glass breaking echoed in the quiet night.

Mongrel stood at the edge of the shattered window, looking down at the lifeless form below. He dusted off his hands.

"Well," he muttered, turning back toward the suite. "Now to deal with that fat bastard."

A few hours later, near midnight, someone quietly slipped into a seemingly ordinary apartment. That someone was Nika.

She removed the Mongrel disguise, setting the mask and arm guards in the corner before collapsing onto the couch. She let out a sigh, ready to relax, when her backup phone began to ring.

The sound jolted her out of her brief moment of peace. She pulled out the device—the one she used exclusively for her Mongrel persona.

"Hello?"

The voice on the other end was unmistakable. Lord Death Man.

"You did a good job taking out the Fatman," he said.

Nika blinked. Wait, the gang leader's actual villain name was 'The Fatman' this whole time? She almost laughed but quickly shoved the thought aside.

"I think it's time I give you the job you've been after," Lord Death Man continued. "From now on, you're the Searcher of my translation."

Before she could respond, he hung up.

Nika stared at the phone for a moment before a slow smile crept across her face.

It had been two years since she joined Lord Death Man's ranks. Two long years of missions, proving her worth, and earning his trust. This position wasn't handed out to just anyone—it had to be earned. And now, she'd finally achieved it.

The Searcher role allowed her to travel freely, gathering information and making decisions without immediate oversight. Unlike scouts who reported directly to headquarters, she could act independently. A high-risk, high-reward position that required absolute trust.

Nika glanced around her modest apartment. Despite earning substantial amounts of money working under Lord Death Man, she had little to show for it.

The majority of her earnings had gone to charities—causes she carefully chose herself. Her living space remained sparse, with only basic furnishings, and she paid for her food out of her own pocket.

Now that she had the freedom to leave Japan, a spark of excitement lit up in her chest.

Finally, I can start my journey as a superhero.

She reached for her phone, pulling up a photo of her new Rogue Sun armor. [By the way, I changed the armor design based on an image sent to me by 'I_am_Death.' This is the new design.]

Over the past two years, her control over the Sun Stone's power had improved dramatically. Techniques that once seemed out of reach were now second nature.

In the original Rogue Sun comics, there was a move called Black Fire—a devastating ability to unleash powerful flames from the chest. It had two main variations:

1. A massive chest beam as wide as the user's torso, capable of obliterating anything in its path.

2. An explosive burst, designed for clearing enemies or causing large-scale destruction to the environment.

But Nika had taken things a step further.

Through rigorous training, she had developed two new variations of the move:

1. Black Fire Piercing Shot – A smaller, concentrated version of the chest beam. While narrower, its piercing power far exceeded the original.

2. Black Fire Burst Ball – A colossal fireball that could be fired from her chest, detonating on impact with immense explosive force.

The second variation had become her personal favorite, giving her a tactical edge when dealing with multiple enemies.

She smirked, brushing a strand of her snow-white hair out of her face. I've come a long way, but I'm ready now.

The time had finally come to step out of the shadows. Nika was prepared to leave Japan behind and immerse herself in the larger DC world.

Author's Note

Hey everyone! I've been having a great time writing this fanfiction, and I've come up with tons of ideas. One of them stood out the most, so I wanted to share it with you.

As I've mentioned before, this fanfiction is about being a hero like any other in DC. That got me thinking—why not create a third fanfiction with the same concept but set in Marvel?

It will be called "Wielding Wind in Marvel" and, as the title suggests, the main character (a man) will have wind powers. There's something specific I want to explore in this story, but I'll need your help first:

1. Cover Image – I haven't found a cover I liked, so if you have any suggestions, please send me one!

2. Costume Design – The costume should be all black and have a ninja-inspired look. Feel free to send me ideas or images for this too!

Now, for a spoiler that's important you can skip it if you want and wait for the fanfiction to release: I've thought about where to set the story in Marvel's timeline. I've debated between starting it during the early days of superheroes or in the middle, like this fanfiction. Ultimately, I've decided to begin the story in the middle superhero era.

But there is an idea that I wanted to use, but it has to be in the beginnings of the superhero era so In the beginning, I'll use the movies as inspiration for the adaptation. However, later in the story, there will be a major shift where we skip to the middle of the superhero timeline. This isn't a time skip for the main character, but rather for the entire world, so the MC will remain the same age and skill level, while the world develops around them. This time skip will be five years. And once that happens, I will use the comics as the main source of inspiration

That's all I wanted to share for now. I hope you enjoy this idea as much as I do! P.S The Love interest will be Luna Snow because she doesn't have a lot of history, I can do a lot with her